I cant get the control key unstuck on my laptop, can't type

I have a sony vaio laptop (model pcg-7t1L), that is running vista. I'm pretty sure the ctrl key is stuck, because when i try to type it opens different windows. I can not get to any web pages, or type period. I bought a usb keyboard, but does not help. Can I bypass the laptop keyboad, for the usb one. I even tried to hit f8 at startup, but was unsucessful. Can someone please help?